on the case
definitions
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to be actively investigating or working on a problem or situationzh: 正在调查或处理某事
examples
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The detective is on the case, trying to find the missing evidence.
侦探正在调查此案,试图找到失踪的证据。
The detective is on the case, trying to find the missing evidence.
侦探正在调查此案,试图找到失踪的证据。